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Given that most of the world refers to W3C XML Schema using either of the abbreviations "WXS" or "XSD", it seems to border on the perverse for the WG to adopt "XSDL" as a standard acronym. Please, pick one of the other two instead.
Personal response: A quick google suggests that the acronym WXS is very rarely used and is not widely recognised. It's not normal practice for languages to have names that are associated with the organisation that specified them, except to distinguish variants of existing languages, such as ECMAScript. And having a "W" that stands for "W3C" in which "W3" stands for "World Wide Web" seems inelegant. (In any case, W is so unpronouncable...) XSD is certainly used quite widely, but usually as a contraction of "XML Schema Definition" (which might mean either a schema or a schema document, it's not clear which). It's not usually used to refer to the language as such. We wanted a name that clearly referred to the language rather than to the schemas that are defined using the language; I don't think XSD would have met that criterion. XSD as a back-formation to describe the objects that are defined using the language now becomes logical, though we're not using it ourselves. Also, having finally decided on a name for the language, changing our minds and deciding on a different one would throw away the last chance we have to establish some uniformity.
RESOLUTION: The abbreviated name for our language will be XSD, not XSDL. Editors' discretion whether to draft note explaining intended uses of that abbreviation. Namespace prefixes for our own markup and datatypes will be normalized to xs:"
A wording proposal for this issue (among others) was sent to the XML Schema WG on 4 February 2008. http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.consent.200802.html (member-only link) For some issues, the proposal is effectively to make no change; see the Status section of the proposal for the specifics.
During its telcon today, the XML Schema WG accepted the 'Structures Omnibus 2' proposal, which includes changes intended to resolve this issue. (Or, for some issues, contains the editors' proposal that the issue should be closed without further changes.) http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.consent.200801.html (member-only link) Accordingly, I'm marking the issue resolved. The originator of this issue (or in some cases the individual, acting on behalf of a group, who filed the comment) should receive an email notification of this change. Please examine the changes and let us know if you agree with this resolution of your issue, by adding a comment to the issue record and changing the Status of the issue to Closed. Or, if you do not agree with this resolution, please add a comment explaining why. If you wish to appeal the WG's decision to the Director, then also change the Status of the record to Reopened. If you wish to record your dissent, but do not wish to appeal the decision to the Director, then change the Status of the record to Closed. If we do not hear from you in the next two weeks, we will assume you agree with the WG decision.